chore(package): update microbundle to version 0.4.1

Closes #17

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "exports-loader": "^0.6.4",
     "fast-async": "^6.3.0",
     "html-webpack-plugin": "^2.30.1",
-    "microbundle": "^0.3.0",
+    "microbundle": "^0.4.1",
     "mocha": "^4.1.0",
     "mocha-chrome": "^1.0.3",
     "mocha-puppeteer": "^0.13.0",